Just stumbled upon the same situation after switching my email to protonmail. It’s a bit a disappointing, but I guess we cannot have everything at all yet
What I do not understand: could this be even solved by Delta Chat alone? (as far as I understand yes, if it would implement full OpenPGP support… but I do not really understand what I am talking about, I just want to able to explain the situation. )
Any links I should read would be appreciated.
For those interested, here is what gathered so far:
In FAQ - Delta Chat i read:
Autocrypt uses a limited subset of OpenPGP functionality.
In OpenPGP Considerations, Part III: Autocrypt and Encryption by Default · OpenKeychain
In K-9 Mail version 5.400, OpenPGP encryption was changed to adhere to the Autocrypt specification.
In “Update on Autocrypt support” on Protonmail reddit by a protonmail staff member (am not allowed more than 2 links, sorry:
Our feeling is that the [autocrypt] protocol has significant security weaknesses and therefore we don’t feel it’s ready for implementation.